• Webster's Revised Unabridged Dictionary
    • n. pl Archencephala (Zoöl) The division that includes man alone.
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Century Dictionary and Cyclopedia
    • archencephala A name proposed by Owen, in 1857, for the highest one of four subclasses into which he divided the class Mammalia according to the character of the brain. In this subclass the brain attains its maximum development in complexity, and especially in the relative size of the cerebrum, which is deeply convoluted, largely overlaps both the olfactory lobes and the cerebellum, and has a well-marked hippocampus minor. It includes man alone, and is conterminous with the order Bimana of some, or the family Hominidæ or Anthropidœ of others. All the cerebral characters adduced are shared by the anthropoid apes, and the term is not in use, except as a synonym of a group of the zoölogical value of a modern family.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. pref. + the brain